package com.example.lotterysystem.service.impl;

import com.example.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import com.example.lotterysystem.common.exception.ServiceException;
import com.example.lotterysystem.common.utils.JacksonUtil;
import com.example.lotterysystem.common.utils.RedisUtil;
import com.example.lotterysystem.controller.param.CreateActivityParam;
import com.example.lotterysystem.controller.param.CreatePrizeByActivityParam;
import com.example.lotterysystem.controller.param.CreateUserByActivityParam;
import com.example.lotterysystem.controller.param.PageParam;
import com.example.lotterysystem.dao.dataobject.ActivityDO;
import com.example.lotterysystem.dao.dataobject.ActivityPrizeDO;
import com.example.lotterysystem.dao.dataobject.ActivityUserDO;
import com.example.lotterysystem.dao.dataobject.PrizeDO;
import com.example.lotterysystem.dao.mapper.*;
import com.example.lotterysystem.service.ActivityService;
import com.example.lotterysystem.service.UserService;
import com.example.lotterysystem.service.dto.ActivityDTO;
import com.example.lotterysystem.service.dto.ActivityDetailDTO;
import com.example.lotterysystem.service.dto.CreateActivityDTO;
import com.example.lotterysystem.service.dto.PageListDTO;
import com.example.lotterysystem.service.enums.ActivityPrizeStatusEnum;
import com.example.lotterysystem.service.enums.ActivityPrizeTiersEnum;
import com.example.lotterysystem.service.enums.ActivityStatusEnum;
import com.example.lotterysystem.service.enums.ActivityUserStatusEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

@Service
public class ActivityServiceImpl implements ActivityService {


    private static final Logger logger = LoggerFactory.getLogger(ActivityServiceImpl.class);

    //活动缓存前置
    private final String ACTIVITY_PREFIX = "ACTIVITY_";

    //活动缓存时间
    private final Long ACTIVITY_TIMEOUT = 60 * 60 * 24 * 3L;

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private PrizeMapper prizeMapper;
    @Autowired
    private ActivityMapper activityMapper;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private ActivityUserMapper activityUserMapper;
    @Autowired
    private RedisUtil redisUtil;


    @Override
    @Transactional(rollbackFor = Exception.class)//设计多表 回滚
    public CreateActivityDTO createActivity(CreateActivityParam param) {
        //校验活动信息是否正确
        checkActivityInfo(param);
        //保存活动信息
        ActivityDO activityDO = new ActivityDO();
        activityDO.setActivityName(param.getActivityName());
        activityDO.setDescription(param.getDescription());
        activityDO.setStatus(ActivityStatusEnum.RUNNING.name());
        activityMapper.insert(activityDO);

        //保存活动关联的奖品信息
        List<CreatePrizeByActivityParam> prizeParams = param.getActivityPrizeList();
        List<ActivityPrizeDO> activityPrizeDOList = prizeParams.stream().map(
                prizeParam -> {
                    ActivityPrizeDO activityPrizeDO = new ActivityPrizeDO();
                    activityPrizeDO.setActivityId(activityDO.getId());
                    activityPrizeDO.setPrizeId(prizeParam.getPrizeId());
                    activityPrizeDO.setPrizeAmount(prizeParam.getPrizeAmount());
                    activityPrizeDO.setPrizeTiers(prizeParam.getPrizeTiers());
                    activityPrizeDO.setStatus(ActivityPrizeStatusEnum.INIT.name());
                    return activityPrizeDO;
                }).collect(Collectors.toList());

        activityPrizeMapper.batchInsert(activityPrizeDOList);

        //保存活动关联的人员信息
        List<CreateUserByActivityParam> userParams = param.getActivityUserList();
        List<ActivityUserDO> activityUserDOList = userParams.stream().map(userParam -> {
            ActivityUserDO activityUserDO = new ActivityUserDO();
            activityUserDO.setActivityId(activityDO.getId());
            activityUserDO.setUserId(userParam.getUserId());
            activityUserDO.setUserName(userParam.getUserName());
            activityUserDO.setStatus(ActivityUserStatusEnum.INIT.name());
            return activityUserDO;
        }).collect(Collectors.toList());
        activityUserMapper.batchInsert(activityUserDOList);
        //整合完整的活动信息 存放redis
        //ActivityDetailDTO :活动信息＋奖品+人员

        //先获取奖品基本属性列表
        //获取需要查询的奖品id
        List<Long> prizeIds = param.getActivityPrizeList().stream()
                .map(CreatePrizeByActivityParam::getPrizeId).distinct().collect(Collectors.toList());

        List<PrizeDO> prizeDOList = prizeMapper.batchSelectByIds(prizeIds);

        ActivityDetailDTO detailDTO = converToActivityDetailDTO(
                activityDO,activityUserDOList,prizeDOList,activityPrizeDOList);
        cacheActivity(detailDTO);

        //构造返回
        CreateActivityDTO createActivityDTO = new CreateActivityDTO();
        createActivityDTO.setActivityId(activityDO.getId());
        return createActivityDTO;

    }

    @Override
    public PageListDTO<ActivityDTO> findActivityList(PageParam param) {

        //获取总量
        int total = activityMapper.count();


        //获取当前页列表
        List<ActivityDO> activityDOList = activityMapper.selectActivityList(param.offset(),param.getPageSize());
        List<ActivityDTO> activityDTOList = activityDOList.stream().map(activityDO -> {
            ActivityDTO activityDTO = new ActivityDTO();
            activityDTO.setActivityId(activityDO.getId());
            activityDTO.setActivityName(activityDO.getActivityName());
            activityDTO.setDescription(activityDO.getDescription());
            activityDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));
            return activityDTO;
        }).collect(Collectors.toList());
        return new PageListDTO<>(total,activityDTOList);
    }

    @Override
    public ActivityDetailDTO getActivityDetail(Long activityId) {
        if(null == activityId){
            logger.warn("查询活动详细信息失败,activityId is null");
            return null;
        }
        //查询redis
        ActivityDetailDTO detailDTO =  getActivityFromCache(activityId);
        if(null != detailDTO){
            logger.info("查询活动详细信息成功!detailDTO{}",JacksonUtil.writeValueAsString(detailDTO));
            return detailDTO;
        }

        //如果redis不存在,查表
        //活动表
        ActivityDO aDO = activityMapper.selectById(activityId);
        //活动奖品表
        List<ActivityPrizeDO> apDOList = activityPrizeMapper.selectByActivityId(activityId);
        //活动人员表
        List<ActivityUserDO> auDOList = activityUserMapper.selectByActivityId(activityId);

        //奖品表
        List<Long> prizeIds = apDOList.stream()
                .map(ActivityPrizeDO::getPrizeId)
                .collect(Collectors.toList());
        List<PrizeDO> pDOList = prizeMapper.batchSelectByIds(prizeIds);
        detailDTO =   converToActivityDetailDTO(aDO,auDOList,pDOList,apDOList);
        cacheActivity(detailDTO);

        return detailDTO;

    }

    @Override
    public void cacheActivity(Long activityId) {
        //查询表数据 : 活动表 关联奖品 关联人员 奖品信息表

        if(null == activityId){
            logger.warn("要缓存的活动id为空");
            throw new ServiceException(ServiceErrorCodeConstants.CACHE_ACTIVITY_ID_IS_EMPTY);
        }

        ActivityDO aDO = activityMapper.selectById(activityId);
        if(null == aDO){
            logger.error("要缓存的活动id有误");
            throw new ServiceException(ServiceErrorCodeConstants.CACHE_ACTIVITY_ID__ERROR);
        }
        //活动奖品表
        List<ActivityPrizeDO> apDOList = activityPrizeMapper.selectByActivityId(activityId);
        //活动人员表
        List<ActivityUserDO> auDOList = activityUserMapper.selectByActivityId(activityId);

        //奖品表
        List<Long> prizeIds = apDOList.stream()
                .map(ActivityPrizeDO::getPrizeId)
                .collect(Collectors.toList());
        List<PrizeDO> pDOList = prizeMapper.batchSelectByIds(prizeIds);

        ActivityDetailDTO detailDTO =   converToActivityDetailDTO(aDO,auDOList,pDOList,apDOList);
        cacheActivity(detailDTO);



    }

    /**
     * 缓存完整的活动信息
     * @param detailDTO
     */
    private void cacheActivity(ActivityDetailDTO detailDTO) {
        //key : ACTIVITY_activityId
        //value : ActivityDetailDTO(json)
        if (null == detailDTO || null == detailDTO.getActivityId()) {
            logger.warn("要缓存的活动信息不存在");
            return;
        }

        try {
            redisUtil.set(ACTIVITY_PREFIX+detailDTO.getActivityId(),
                    JacksonUtil.writeValueAsString(detailDTO), ACTIVITY_TIMEOUT);
        }catch (Exception e){
            logger.error("缓存活动异常,{}",JacksonUtil.writeValueAsString(detailDTO),e);
        }
    }

    /**
     * 根据活动id获取详细信息
     * @param activityId
     * @return
     */
    private ActivityDetailDTO getActivityFromCache(Long activityId) {
        if(null == activityId){
            logger.warn("获取活动数据的activityId为空");
            return null;
        }
        try {
            String str = redisUtil.get(ACTIVITY_PREFIX+activityId);
            if(!StringUtils.hasText(str)){
                logger.error("获取缓存活动数据为空!,key=:{}",ACTIVITY_PREFIX+activityId);
                return null;
            }
            return  JacksonUtil.readValue(str, ActivityDetailDTO.class);
        }catch (Exception e){
            logger.error("从缓存中获取活动信息异常,{}",activityId,e);
            return null;
        }

    }

    private ActivityDetailDTO converToActivityDetailDTO(ActivityDO activityDO, List<ActivityUserDO> activityUserDOList,
                                           List<PrizeDO> prizeDOList, List<ActivityPrizeDO> activityPrizeDOList) {
        ActivityDetailDTO detailDTO = new ActivityDetailDTO();
        detailDTO.setActivityId(activityDO.getId());
        detailDTO.setActivityName(activityDO.getActivityName());
        detailDTO.setDesc(activityDO.getDescription());
        detailDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));

        List<ActivityDetailDTO.PrizeDTO> prizeDTOList = activityPrizeDOList.stream()
                .map(apDO -> {
                    ActivityDetailDTO.PrizeDTO prizeDTO = new ActivityDetailDTO.PrizeDTO();
                    prizeDTO.setPrizeId(apDO.getPrizeId());

                    Optional<PrizeDO> optionalPrizeDO = prizeDOList.stream().filter(prizeDO ->
                        prizeDO.getId().equals(apDO.getPrizeId()))
                            .findFirst();

                    optionalPrizeDO.ifPresent(prizeDO -> {
                        prizeDTO.setName(prizeDTO.getName());
                        prizeDTO.setImageUrl(prizeDTO.getImageUrl());
                        prizeDTO.setPrice(prizeDTO.getPrice());
                        prizeDTO.setDescription(prizeDTO.getDescription());
                    });



                    prizeDTO.setTiers(ActivityPrizeTiersEnum.forName(apDO.getPrizeTiers()));
                    prizeDTO.setPrizeAmount(apDO.getPrizeAmount());
                    prizeDTO.setStatus(ActivityPrizeStatusEnum.forName(apDO.getStatus()));


                    return prizeDTO;
                }).collect(Collectors.toList());

        detailDTO.setPrizeDTOList(prizeDTOList);

        List<ActivityDetailDTO.UserDTO> userDTOList = activityUserDOList.stream().map(auDO ->{
            ActivityDetailDTO.UserDTO userDTO = new ActivityDetailDTO.UserDTO();
            userDTO.setUserId(auDO.getUserId());
            userDTO.setUserName(auDO.getUserName());
            userDTO.setStatus(ActivityUserStatusEnum.forName(auDO.getStatus()));


            return userDTO;
        }).collect(Collectors.toList());

        detailDTO.setUserDTOList(userDTOList);
        return detailDTO;

    }

    /**
     * 校验活动
     * @param param
     */
    private void checkActivityInfo(CreateActivityParam param) {
        if(null == param) {
            throw new ServiceException(ServiceErrorCodeConstants.CREATE_ACTIVITY_INFO_IS_EMPTY);
        }
        //校验人员id 在人员表中存在
        List<Long> userIds = param.getActivityUserList().stream().map(CreateUserByActivityParam::getUserId)
                .distinct().collect(Collectors.toList());
        List<Long> existUserIds = userMapper.selectExistByIds(userIds);

        if (CollectionUtils.isEmpty(existUserIds)){
            throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_USER_ERROR);
        }


        userIds.forEach(userId -> {
            if(!existUserIds.contains(userId)) {
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_USER_ERROR);
            }
        });
        //奖品id在奖品表中是否存在
        List<Long> prizeIds = param.getActivityPrizeList().stream().map(CreatePrizeByActivityParam::getPrizeId)
                .distinct().collect(Collectors.toList());
        List<Long> existPrizeIds = prizeMapper.selectExistByIds(prizeIds);

        if(CollectionUtils.isEmpty(existPrizeIds)) {
            throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_ERROR);
        }


        prizeIds.forEach(prizeId -> {
            if(!existPrizeIds.contains(prizeId)) {
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_ERROR);
            }
        });


        //人员数量大于等于奖品数量
        int userAmount = param.getActivityUserList().size();
        long prizeAmount = param.getActivityPrizeList().stream()
                .mapToLong(CreatePrizeByActivityParam::getPrizeAmount)
                .sum();
        if(prizeAmount > userAmount) {
            throw new ServiceException(ServiceErrorCodeConstants.USER_PRIZE_AMOUNT_ERROR);
        }
        //校验活动奖品有效
        param.getActivityPrizeList().forEach(Prize -> {
           if(null == ActivityPrizeTiersEnum.forName(Prize.getPrizeTiers())){
               throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_TIERS_ERROR);
           }
        });

    }
}
